mchades commented on code in PR #10982:
URL: https://github.com/apache/gravitino/pull/10982#discussion_r3208584837


##########
server/src/test/java/org/apache/gravitino/server/web/rest/TestViewOperations.java:
##########
@@ -0,0 +1,425 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.gravitino.server.web.rest;
+
+import static org.apache.gravitino.Configs.CACHE_ENABLED;
+import static org.apache.gravitino.Configs.ENABLE_AUTHORIZATION;
+import static org.apache.gravitino.Configs.TREE_LOCK_CLEAN_INTERVAL;
+import static org.apache.gravitino.Configs.TREE_LOCK_MAX_NODE_IN_MEMORY;
+import static org.apache.gravitino.Configs.TREE_LOCK_MIN_NODE_IN_MEMORY;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.Map;
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.client.Entity;
+import javax.ws.rs.core.Application;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.apache.commons.lang3.reflect.FieldUtils;
+import org.apache.gravitino.Audit;
+import org.apache.gravitino.Config;
+import org.apache.gravitino.GravitinoEnv;
+import org.apache.gravitino.NameIdentifier;
+import org.apache.gravitino.catalog.SchemaDispatcher;
+import org.apache.gravitino.catalog.ViewDispatcher;
+import org.apache.gravitino.dto.rel.ColumnDTO;
+import org.apache.gravitino.dto.rel.SQLRepresentationDTO;
+import org.apache.gravitino.dto.rel.ViewDTO;
+import org.apache.gravitino.dto.requests.ViewCreateRequest;
+import org.apache.gravitino.dto.requests.ViewUpdateRequest;
+import org.apache.gravitino.dto.requests.ViewUpdatesRequest;
+import org.apache.gravitino.dto.responses.DropResponse;
+import org.apache.gravitino.dto.responses.EntityListResponse;
+import org.apache.gravitino.dto.responses.ErrorConstants;
+import org.apache.gravitino.dto.responses.ErrorResponse;
+import org.apache.gravitino.dto.responses.ViewResponse;
+import org.apache.gravitino.exceptions.NoSuchSchemaException;
+import org.apache.gravitino.exceptions.NoSuchViewException;
+import org.apache.gravitino.exceptions.ViewAlreadyExistsException;
+import org.apache.gravitino.lock.LockManager;
+import org.apache.gravitino.rel.Column;
+import org.apache.gravitino.rel.Representation;
+import org.apache.gravitino.rel.SQLRepresentation;
+import org.apache.gravitino.rel.View;
+import org.apache.gravitino.rel.ViewChange;
+import org.apache.gravitino.rest.RESTUtils;
+import org.glassfish.jersey.internal.inject.AbstractBinder;
+import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.test.TestProperties;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class TestViewOperations extends BaseOperationsTest {
+
+  private static final String VND_V1_JSON = 
"application/vnd.gravitino.v1+json";
+
+  private static class MockServletRequestFactory extends 
ServletRequestFactoryBase {
+    @Override
+    public HttpServletRequest get() {
+      HttpServletRequest request = mock(HttpServletRequest.class);
+      when(request.getRemoteUser()).thenReturn(null);
+      return request;
+    }
+  }
+
+  private static SchemaDispatcher schemaDispatcher = 
mock(SchemaDispatcher.class);
+  private final ViewDispatcher dispatcher = mock(ViewDispatcher.class);
+  private final String metalake = "metalake";
+  private final String catalog = "catalog1";
+  private final String schema = "default";
+
+  @BeforeAll
+  public static void setup() throws IllegalAccessException {
+    Config config = mock(Config.class);
+    Mockito.doReturn(100000L).when(config).get(TREE_LOCK_MAX_NODE_IN_MEMORY);
+    Mockito.doReturn(1000L).when(config).get(TREE_LOCK_MIN_NODE_IN_MEMORY);
+    Mockito.doReturn(36000L).when(config).get(TREE_LOCK_CLEAN_INTERVAL);
+    Mockito.doReturn(false).when(config).get(CACHE_ENABLED);
+    Mockito.doReturn(false).when(config).get(ENABLE_AUTHORIZATION);
+    FieldUtils.writeField(GravitinoEnv.getInstance(), "config", config, true);
+    FieldUtils.writeField(GravitinoEnv.getInstance(), "lockManager", new 
LockManager(config), true);
+    Mockito.doReturn(true).when(schemaDispatcher).schemaExists(any());
+  }

Review Comment:
   Good catch. schemaDispatcher in TestViewOperations was dead setup and never 
bound into ResourceConfig. I removed the unused mock/stubbing to keep the test 
intent clear. Addressed in commit 8b7219fad.



##########
common/src/main/java/org/apache/gravitino/dto/rel/SQLRepresentationDTO.java:
##########
@@ -18,53 +18,133 @@
  */
 package org.apache.gravitino.dto.rel;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
+import com.google.common.base.Preconditions;
+import java.util.Objects;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.gravitino.rel.Representation;
-import org.apache.gravitino.rel.SQLRepresentation;
 
-/** DTO for SQL representation. */
-@Getter
-@EqualsAndHashCode(callSuper = true)
-public class SQLRepresentationDTO extends RepresentationDTO {
+/**
+ * A DTO mirroring {@link org.apache.gravitino.rel.SQLRepresentation}. 
Represents a SQL-based view
+ * definition for a particular dialect.
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class SQLRepresentationDTO extends RepresentationDTO {
+
+  @JsonProperty("type")
+  private final String type = Representation.TYPE_SQL;
 
   @JsonProperty("dialect")
   private String dialect;
 
   @JsonProperty("sql")
   private String sql;
 
-  private SQLRepresentationDTO() {}
+  private SQLRepresentationDTO() {
+    super();
+  }
+
+  private SQLRepresentationDTO(String dialect, String sql) {
+    this.dialect = dialect;
+    this.sql = sql;
+  }
 
   /**
-   * Creates a SQL representation DTO.
+   * Creates a new {@link Builder}.
    *
-   * @param dialect SQL dialect.
-   * @param sql SQL body.
+   * @return A new builder instance.
    */
-  public SQLRepresentationDTO(String dialect, String sql) {
-    this.dialect = dialect;
-    this.sql = sql;
+  public static Builder builder() {
+    return new Builder();
   }
 
   @Override
   public String type() {
-    return Representation.TYPE_SQL;
+    return type;
   }
 
-  @Override
-  public SQLRepresentation toRepresentation() {
-    return 
SQLRepresentation.builder().withDialect(dialect).withSql(sql).build();
+  /**
+   * Returns the SQL dialect of this representation.
+   *
+   * @return The dialect identifier.
+   */
+  public String dialect() {
+    return dialect;
   }
 
   /**
-   * Creates SQL representation DTO from SQL representation.
+   * Returns the SQL text of this representation.
    *
-   * @param representation SQL representation.
-   * @return SQL representation DTO.
+   * @return The SQL text.
    */
-  public static SQLRepresentationDTO fromSQLRepresentation(SQLRepresentation 
representation) {
-    return new SQLRepresentationDTO(representation.dialect(), 
representation.sql());
+  public String sql() {
+    return sql;
+  }

Review Comment:
   Thanks for calling out compatibility risk. We intentionally keep 
SQLRepresentationDTO minimal in this PR and do not reintroduce JavaBean-style 
compatibility methods. This DTO is newly introduced with the logical view REST 
surface and is not yet a stable released client contract. Current usage in this 
codebase is already on dialect() / sql() / builder APIs, so we prefer not to 
expand the API surface at this stage.



##########
common/src/main/java/org/apache/gravitino/dto/rel/SQLRepresentationDTO.java:
##########
@@ -18,53 +18,133 @@
  */
 package org.apache.gravitino.dto.rel;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
+import com.google.common.base.Preconditions;
+import java.util.Objects;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.gravitino.rel.Representation;
-import org.apache.gravitino.rel.SQLRepresentation;
 
-/** DTO for SQL representation. */
-@Getter
-@EqualsAndHashCode(callSuper = true)
-public class SQLRepresentationDTO extends RepresentationDTO {
+/**
+ * A DTO mirroring {@link org.apache.gravitino.rel.SQLRepresentation}. 
Represents a SQL-based view
+ * definition for a particular dialect.
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class SQLRepresentationDTO extends RepresentationDTO {
+
+  @JsonProperty("type")
+  private final String type = Representation.TYPE_SQL;
 
   @JsonProperty("dialect")
   private String dialect;
 
   @JsonProperty("sql")
   private String sql;
 
-  private SQLRepresentationDTO() {}
+  private SQLRepresentationDTO() {
+    super();
+  }
+
+  private SQLRepresentationDTO(String dialect, String sql) {
+    this.dialect = dialect;
+    this.sql = sql;
+  }
 
   /**
-   * Creates a SQL representation DTO.
+   * Creates a new {@link Builder}.
    *
-   * @param dialect SQL dialect.
-   * @param sql SQL body.
+   * @return A new builder instance.
    */
-  public SQLRepresentationDTO(String dialect, String sql) {
-    this.dialect = dialect;
-    this.sql = sql;
+  public static Builder builder() {
+    return new Builder();
   }
 
   @Override
   public String type() {
-    return Representation.TYPE_SQL;
+    return type;
   }
 
-  @Override
-  public SQLRepresentation toRepresentation() {
-    return 
SQLRepresentation.builder().withDialect(dialect).withSql(sql).build();
+  /**
+   * Returns the SQL dialect of this representation.
+   *
+   * @return The dialect identifier.
+   */
+  public String dialect() {
+    return dialect;
   }
 
   /**
-   * Creates SQL representation DTO from SQL representation.
+   * Returns the SQL text of this representation.
    *
-   * @param representation SQL representation.
-   * @return SQL representation DTO.
+   * @return The SQL text.
    */
-  public static SQLRepresentationDTO fromSQLRepresentation(SQLRepresentation 
representation) {
-    return new SQLRepresentationDTO(representation.dialect(), 
representation.sql());
+  public String sql() {
+    return sql;
+  }
+
+  @Override
+  public void validate() throws IllegalArgumentException {
+    Preconditions.checkArgument(
+        StringUtils.isNotBlank(dialect), "\"dialect\" field is required and 
cannot be empty");
+    Preconditions.checkArgument(
+        StringUtils.isNotBlank(sql), "\"sql\" field is required and cannot be 
empty");
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (!(o instanceof SQLRepresentationDTO)) return false;
+    SQLRepresentationDTO that = (SQLRepresentationDTO) o;
+    return Objects.equals(dialect, that.dialect) && Objects.equals(sql, 
that.sql);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(dialect, sql);
+  }
+
+  @Override
+  public String toString() {
+    return "SQLRepresentationDTO{" + "dialect='" + dialect + '\'' + ", sql='" 
+ sql + '\'' + '}';
+  }
+
+  /** Builder for {@link SQLRepresentationDTO}. */
+  public static final class Builder {
+
+    private String dialect;
+    private String sql;
+
+    private Builder() {}
+
+    /**
+     * Sets the dialect.
+     *
+     * @param dialect The dialect identifier.
+     * @return This builder.
+     */
+    public Builder withDialect(String dialect) {
+      this.dialect = dialect;
+      return this;
+    }
+
+    /**
+     * Sets the SQL text.
+     *
+     * @param sql The SQL text.
+     * @return This builder.
+     */
+    public Builder withSql(String sql) {
+      this.sql = sql;
+      return this;
+    }
+
+    /**
+     * Builds a new {@link SQLRepresentationDTO}.
+     *
+     * @return The constructed instance.
+     */
+    public SQLRepresentationDTO build() {

Review Comment:
   Agreed. I updated SQLRepresentationDTO.Builder.build() to validate required 
fields (dialect/sql) for fail-fast behavior, and added coverage in 
TestRepresentationDTO for missing dialect and blank sql cases. Addressed in 
commit 8b7219fad.



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